Surname Underdahl (Underdahl 
) , throughout the world, is a rare family name. The surname Underdahl is characteristic of Norway, where it is a rare surname, the United States, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, Canada, and Norway.
| VARIANT | COUNTRY |
|---|---|
| Underdahl | Australia, Canada, Norway, New Zealand, United States |
| james underdahl Canadian politician, CA (b. 1894) |
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| brian underdahl (b. 1948) |
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